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Reserves for unpaid losses and loss adjustment expenses
 9 Months Ended
Sep. 30, 2020
Insurance [Abstract]  
Reserves for unpaid losses and loss adjustment expenses Reserves for unpaid losses and loss adjustment expenses
The following table summarizes the loss and LAE reserve activities of Sirius Group for the three and nine months ended September 30, 2020 and 2019:
 Three months ended September 30,Nine months ended September 30,
(Millions)2020201920202019
Gross beginning balance$2,515.1 $2,023.3 $2,331.5 $2,016.7 
Less beginning reinsurance recoverable on unpaid losses(442.2)(357.4)(410.3)(350.2)
Net loss and LAE reserve balance2,072.9 1,665.9 1,921.2 1,666.5 
Losses and LAE incurred relating to:
Current year losses305.5 342.2 967.5 723.6 
Prior years losses(0.1)6.4 5.3 86.9 
Total net incurred losses and LAE305.4 348.6 972.8 810.5 
Foreign currency translation adjustment to net loss and LAE reserves20.8 (15.3)12.2 (15.3)
Accretion of fair value adjustment to net loss and LAE reserves0.1 — 0.1 0.1 
Loss and LAE paid relating to:
Current year losses81.6 97.7 149.2 254.8 
Prior years losses127.2 108.0 566.7 413.5 
Total loss and LAE payments208.8 205.7 715.9 668.3 
Net ending balance2,190.4 1,793.5 2,190.4 1,793.5 
Plus ending reinsurance recoverable on unpaid losses482.5 392.9 482.5 392.9 
Gross ending balance$2,672.9 $2,186.4 $2,672.9 $2,186.4 
Loss and LAE development - Three Months Ended September 30, 2020
For the three months ended September 30, 2020, Sirius Group had a net favorable loss reserve development of $0.1 million. Favorable loss reserve development in U.S. Specialty ($0.8 million) and Runoff & Other ($0.4 million) were partially offset by unfavorable loss reserve development in Global Reinsurance ($1.3 million).
Loss and LAE development - Three Months Ended September 30, 2019
For the three months ended September 30, 2019, Sirius Group had net unfavorable loss reserve development of $6.4 million. Increases in loss reserve estimates were recorded in Global Reinsurance ($10.9 million) due to higher than expected activity in the Casualty Reinsurance book. These increases were partially offset by favorable loss reserve development in Global A&H ($5.8 million).
Loss and LAE development - Nine Months Ended September 30, 2020
For the nine months ended September 30, 2020, Sirius Group had net unfavorable loss reserve development of $5.3 million. Increases in loss reserve estimates for Global Reinsurance ($14.9 million) were partially offset by favorable loss reserve development in Global A&H ($7.6 million) and U.S. Specialty ($2.0 million). Within Global Reinsurance, unfavorable loss reserve development in Other Property ($21.6 million), Aviation & Space ($10.1 million) and Casualty Reinsurance ($9.2 million) was partially offset by favorable loss reserve development in Property Catastrophe Excess Reinsurance ($22.5 million). The reduction in Property Catastrophe Excess Reinsurance was due to reductions in reserve estimates for prior year catastrophe events, mainly Typhoons Faxai and Hagibis.
Loss and LAE development - Nine Months Ended September 30, 2019 For the nine months ended September 30, 2019, Sirius Group had net unfavorable loss reserve development of $86.9 million. Increases in loss reserve estimates were recorded in Global Reinsurance ($82.7 million) and Runoff & Other ($5.4 million). The unfavorable loss reserve development in Global Reinsurance was primarily attributable to higher prior year catastrophe events, including Typhoon Jebi and Hurricanes Michael, Florence, and Irma.